Chemical modification

Xem 1-20 trên 42 kết quả Chemical modification
  • In our studies on the phytochemistry and biological activities of Croton tonkinensis Gagnep. (Euphorbiaceae) oriented by traditional medicine interesting biological activities of the plant were demonstrated in correlation with the ent-kaurane-type diterpenoid constituents. The high accumulation of the active principle ent-18-acetoxy-7-hydroxykaur-16-en-15-one (1) led to our recent study on the chemical modification of this lead compound. In this paper the transformations of 1 into several derivatives by hydrolysis, acetylation, and oxydation were reported.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: A Viral Platform for Chemical Modification and Multivalent Display

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  • Free nucleotides in living cells play important roles in a variety of biolo-gical reactions, and often undergo chemical modifications of their base moieties. As modified nucleotides may have deleterious effects on cells, they must be eliminated from intracellular nucleotide pools.

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  • companion document, entitled Guidance on Safety Performance Indicators (2003), will be published immediately following the 2nd edition of the Guiding Principles. The Guidance on SPI is designed to assist relevant stakeholders to establish programmes for assessing their own performance related to the prevention of, preparedness for, and response to chemical accidents.

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  • In the recharge area, oxidising conditions occur and dissolution of calcium and bicarbonate dominates. As the water continues to move down dip, further modifications are at first limited. By observing the redox potential (Eh) of abstracted groundwater, a sharp redox barrier was detected beyond the edge of the confining layer, corresponding to the complete exhaustion of dissolved oxygen. Bicarbonate increases and the pH rises until buffering occurs at about 8.3.

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  • The DNA of every cell in the body carries a pattern of chemical modifications due to the methylation of cytosine in the dinucleo-tide sequence 5¢CG. It is thought that these chemical marks help to define the pattern of gene expression that is appropriate for each cell type.

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  • The crystal structure of human pancreatic cationic trypsin showed the chemical modification of Tyr154, which was originally described as phos-phorylation [Gaboriaud C, Serre L, Guy-Crotte O, Forest E & Fontecilla-Camps JC (1996)J Mol Biol259, 995–1010]. Here we report that Tyr154 is sulfated, not phosphorylated.

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  • Polyacrylonitrile (PAN) membrane has been prepared by phase inversion method and subsequently modified by surface grafting polymerization of acrylic acid (AA). The influence of the surface modification on membrane properties has been investigated through the surface characteristics and separation performance.

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  • All rights reserved. No part of this documentation may be transmitted, transcribed, stored in a backup device or translated into another language without Fagor Automation’s consent. The information described in this manual may be changed due to technical modifications. Fagor Automation reserves the right to make any changes to the contents of this manual without prior notice.

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  • Thermoplastics can be used for various applications, which range from household articles to the aeronautic sector. This book, "Thermoplastic Elastomers", is comprised of nineteen chapters, written by specialized scientists dealing with physical and/or chemical modifications of thermoplastics and thermoplastic starch. Such studies will provide a great benefit to specialists in food, electric, telecommunication devices, and plastic industries. Each chapter provides a comprehensive introduction to a specific topic, with a survey of developments to date....

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  • Research in starch biosynthesis is likely to have a great impact on agriculture and industry in coming years. Although the original purpose of research into starch synthesis was not industrial application, it is an example of how science, while trying to answer fundamental questions, may lead to the manipulation of nature for beneficial purposes. Although the basic studies of starch synthesis were carried out in England during the 1940s, and led to the discovery of phosphorylase and Q-enzyme (branching enzyme), the basis of our modern ideas originated in Argentina from the work of Luis F.

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  • This book is intended to bring solution protein chemistry to proteomic technology and to provide a different perspective from other review works. Proteomics, while a diffuse area, is an extension of classical protein chemistry largely driven by major advances in the analytical capability of mass spectrometry. The content assembles together some disparate areas into a single volume. The author has also tried to use as much classical protein chemistry literature as possible as this serves as the intellectual basis for proteomics.

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  • Since the subject of nuclear magnetic resonance (NMR) was awarded its first Nobel Prize in 1952 due to its successful detection by Bloch and Purcell in 1945, the technology and its applications have developed tremendously. The first two decades were focused on technical developments of instrumentation and methodologies to apply to the structure determination of compounds. During the late 1970s, several research groups developed modifications of NMR probes to convert them to an online mode for the analysis of sample mixtures....

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  • Murine Atg8L⁄Apg8L has significant homology with the other known mammalian Atg8 homologs, LC3, GABARAP and GATE-16. However, it is unclear whether murine Atg8L modification is mediated by human Atg4B, Atg7 and Atg3. Expression of Atg8L in HEK293 cells led to clea-vage of its C-terminus.In vitro, the C-terminus of Atg8L was cleaved by human Atg4B, but not human Atg4A or Atg4C.

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  • Pollution prevention. IPPC presumes the use of preventative techniques before any consideration of end-of-pipe control techniques. Many pollution prevention techniques can be applied to LVOC processes and Section 5.2 describes them in terms of source reduction (preventing waste arisings by modifications to products, input materials, equipment and procedures), recycling and waste minimisation initiatives. Air pollutant control.

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  • Combustion units (process furnaces, steam boilers and gas turbines) give rise to emissions of carbon dioxide, nitrogen oxides, sulphur dioxide and particulates. Nitrogen oxide emissions are most commonly reduced by combustion modifications that reduce temperatures and hence the formation of thermal NOx. The techniques include low NOx burners, flue gas recirculation, and reduced pre-heat. Nitrogen oxides can also be removed after they have formed by reduction to nitrogen using Selective Non Catalytic Reduction (SNCR) or Selective Catalytic Reduction (SCR). Water pollutant control.

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  • Drug and alcohol abuse by people with severe and persistent mental illness (SPMI) is one of the most signifi cant problems facing the public mental health system. Referred to variously as people with dual disorders or dual diagnosis, mentally ill chemical abusers, and individuals with co-occurring psychiatric and substance disorders, these patients pose major problems for themselves, their families, clinicians, and the mental health system.

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  • At the optimal temperature (65C),Thermus thermophiluspolynucleotide phosphorylase (Tth PNPase), produced inEscherichia colicells and isolated to functional homogeneity, completely destroys RNAs that possess even a very stable intramolecular secondary structure, but leaves intact RNAs whose 3¢ end is protected by chemical modification or by hybridization with a complementary oligonucleotide.

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  • Cellulose and wheat straw degradation byRuminococcus albuswas moni-tored using NMR spectroscopy. In situ solid-state 13 C-cross-polarization magic angle spinning NMR was used to monitor the modification of the composition and structure of cellulose and 13 C-enriched wheat straw during the growth of the bacterium on these substrates.

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  • UDP-galactose 4-epimerases from the yeastKluyvero-myces fragilisandEscherichia coliare both homodimers but the molecular mass of the former (75 kDa/subunit) is nearly double that of the latter (39kDa/subunit). Protein databank sequence homology revealed the possibility of mutarotase activity in the excess mass of the yeast enzyme. This was confirmed by three independent assay protocols. With the help of specific inhibitors and chem-ical modification reagents, the catalytic sites of epimerase and mutarotase were shown to be distinct and inde-pendent....

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